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<table width="100%" summary="page for PatentsHGH"><tr><td>PatentsHGH</td><td align="right">R Documentation</td></tr></table>

<h2>Dynamic Relation Between Patents and R\&amp;D </h2>

<h3>Description</h3>


<p>a panel of 346 observations  from 1975  to 1979 
</p>
<p><EM>number of observations</EM> :  1730
</p>
<p><EM>observation</EM> :  production units
</p>
<p><EM>country</EM> :  United States
</p>


<h3>Usage</h3>

<pre>data(PatentsHGH)</pre>


<h3>Format</h3>

<p>A dataframe containing :
</p>

<dl>
<dt>obsno</dt><dd><p>firm index</p>
</dd>
<dt>year</dt><dd><p>year</p>
</dd>
<dt>cusip</dt><dd><p> Compustat's identifying number for the firm (Committee on Uniform Security Identification Procedures number)</p>
</dd>
<dt>ardsic</dt><dd><p>a two-digit code for the applied R&amp;D industrial classification (roughly that in Bound, Cummins, Griliches, Hall, and Jaffe, in the Griliches R&amp;D, Patents, and Productivity volume)</p>
</dd>
<dt>scisect</dt><dd><p>is the firm in the scientific sector ?</p>
</dd>
<dt>logk</dt><dd><p>the logarithm of the book value of capital in 1972.</p>
</dd>
<dt>sumpat</dt><dd><p>the sum of patents applied for between 1972-1979. </p>
</dd>
<dt>logr</dt><dd><p> the logarithm of R&amp;D spending during the year (in 1972 dollars)</p>
</dd>
<dt>logr1</dt><dd><p> the logarithm of R&amp;D spending (one year lag)</p>
</dd>
<dt>logr2</dt><dd><p> the logarithm of R&amp;D spending (two years lag)</p>
</dd>
<dt>logr3</dt><dd><p> the logarithm of R&amp;D spending (three years lag)</p>
</dd>
<dt>logr4</dt><dd><p> the logarithm of R&amp;D spending (four years lag)</p>
</dd>
<dt>logr5</dt><dd><p> the logarithm of R&amp;D spending (five years lag)</p>
</dd>
<dt>pat</dt><dd><p>the number of patents applied for during the year that were eventually granted</p>
</dd>
<dt>pat1</dt><dd><p>the number of patents (one year lag)</p>
</dd>
<dt>pat2</dt><dd><p>the number of patents (two years lag)</p>
</dd>
<dt>pat3</dt><dd><p>the number of patents (three years lag)</p>
</dd>
<dt>pat4</dt><dd><p>the number of patents (four years lag)</p>
</dd>
</dl>



<h3>Source</h3>


<p>Hall, Bronwyn ,  Zvi   Griliches and   Jerry    Hausman (1986) &ldquo;Patents and R&amp;D: Is There a Lag?&rdquo;, <EM>International Economic Review</EM>, <B>27</B>, 265-283.
</p>


<h3>References</h3>


<p>Cameron, A.C.  and   Trivedi P.K. (1998) <EM>Regression analysis of count data</EM>, Cambridge University Press, <a href="http://cameron.econ.ucdavis.edu/racd/racddata.html">http://cameron.econ.ucdavis.edu/racd/racddata.html</a>, chapter 9.
</p>
<p>Cameron, A.C.  and  P.K.  Trivedi (2005) <EM>Microeconometrics : methods and applications</EM>, Cambridge, pp. 792&ndash;5.
</p>


<h3>See Also</h3>

<p><code>Index.Source</code>, <code>Index.Economics</code>, <code>Index.Econometrics</code>, <code>Index.Observations</code>,
</p>
<p><code>Index.Time.Series</code></p>


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